Given the function rule f(x) = x^2 - 5x +1, what is the output of f(-3)?
A. 7*
B. -5
C. 25
D. 5
OH nevermind the -3^2 equals a postitive 9, not a negative
if you used the google calculator then they messed up the problem
so here is how to figure it out (for those doing aip)
function rule: f(x) = x^2 - 5x + 1
substitute: f(-3) = -3^2 - 5(-3) + 1
-3^2 = 9
(two negatives times each other equals a positive)
5 x -3 = -15
(a positive times a negative equals a negative, same way vice versa)
9 - (-15) = 24
(when subtracting a negative from a postive, it's basically just adding the negative to the postive)
24 + 1 = 25
Is it 25 or 7
is it 25 or 7 does anyone know?
simply replace x with -3 and evaluate.
Well, I did and I got 7. I hope it's right.
Anyway, thank you for your time and have a nice day.
Don't understand how you got 7
f(-3) = (-3)^2 - 5(-3) + 1
= 9 + 15 + 1
= 25